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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d55f4ccec4c98ab0b07b04770567d8ac51f5666c66c8eccc3f747b44aa62f3' 
  AND token = 'fdsZiQn0ET+OFSlPGNtOtewRL1frw2aEmoiuh+K4+gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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