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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2c21843b8451f89edf665fa97df486061e0b17b3d4785fe51b09fe2d0a27e3' 
  AND token = 'bcpP83ygYQ5jlu8maaKzxQ7rIoP63lXpBPcURQ0A/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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