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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266e6db0e000eaebb76487429137a2c4a53eb7943481e51b3b56246550576bb7' 
  AND token = 'QjXZTddvG1Se3EQ+Xn9Swmktv0Pu4M+FhvVjB1SF2ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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