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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2c7b685e668c3f0a7fa78db8f87dee8acc9f3f2c7e4ff319e43ed50a526e90' 
  AND token = 'yx3ANiDfXDXcFBOcl4XxkeRnBOUIgWvUCwXaJhHFP4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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