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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34b8a034fe35253f727dda952c8ff963b1a2e6a9b5bb2ba0cd30c5fe6b2c202' 
  AND token = '3RKGI/NkvN1Gxc87m2vR0nLQN+3RgaChf+YeOcBb0YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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