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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09987e80a93e421a5af62f75521571e738207bc37819e1c3c04757a22d5abfe7' 
  AND token = 'h99Kc14MfQI0nu+VIRPt7PMNthZbBygmI2rFWzK97uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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