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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc02307f6d5057447c4510ea7e03343bad40d02bf52cd21e46c620471e03814d' 
  AND token = 'IozOsZHmjZrIr3tZTyR4BNywVY19V/6q2MgU1Ch4MhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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