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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b8133c0a6e9c20edc042314da69ebbfc3e9528187665800fe2ca7924cea8c8' 
  AND token = 'dfQuWik9VEy2jA0LlzvlQjhTxAoye/BzJZ0yb6tBxz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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