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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f575e0537730d17e75dcf0366050669a63769f6da4515d9019200d46fd8b118d' 
  AND token = 'BRJGlCd9C5Zi1+8lyj72tzPkFkAzwC/4HTWYJ1Tmi1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}