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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d71fb6201c153019d631a0c9e316521eb96fe629aa31c52047fe18e8a1545' 
  AND token = 'Xl5EZWaNOpsI4Wbe2rvHUQ5GGAkOwZZyzeMN8BB4lfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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