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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1522b435eea692de86d32f687fb97469d9f46e6da4ef90d163ddceaa6c63677' 
  AND token = 'mZN7+mCuFbREo4lvDbyz4PfvzLsfNO+S04DXnJTi8pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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