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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7426643a9d78484e6f129f91d0c819d3b0cb2855c292ac3f05beb3c94b4b43' 
  AND token = 'Xhr0xYSSL5YOTu4/Ss7pxvdevOHJjF+Rx1VR1cBySYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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