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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe3f7b4c0bc8757843b3d7a5060c39626db8f03d793ea969604b5046b69050a' 
  AND token = 'Rky8pLKhlwDU1LUglT3xF6FdB5OgN11d+4Jap4ghr+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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