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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988ba22b13a818be8f547cd28ed6d3c646dc9868430daa28c33b5b52110b7508' 
  AND token = 'IswMzFdvA0Y7UE7l/QcdYEDVfDNVT5t/BziP6rQ9mmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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