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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad09ebdc0b60eddb9301def5771a2971449bb3b08277893ee0d36956ad532961' 
  AND token = 'HfcrE2RNeZ4tk+ti9n7gzkGEcb5eHE8yHGx3/cmlAqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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