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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d379534a3126f8b00b302c8bc2d56d5575695bec603cf130b45c009314f89c5' 
  AND token = 'cGT75R4pyQ1I2X0l5Z483V5ee30jKjg3gTuYVXpCr9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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