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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b955406588278881fef01c3f857c2ac2b70e3421ba35b476263e60ae3bea89a' 
  AND token = 'a1ypqMgCw6e8WMtAjQnM3pxYb1z256Nlb7AYXqvS4Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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