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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2c45ae97060d1d7b03add0f182d4c28e28f43acde6321ca8abb0a5928ff488' 
  AND token = 'T9E9sZSA/yR8q6Zj5TfG8Iv6pnHzTCmRD4t0GlxF3k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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