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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d9ad236378fab87e99b64c9140d1702e324730312785288e30268b9ca4d26d' 
  AND token = '5Si9E6QxK6LZE4JF5msJpiT7cmoRLMiNP3kQzZdGFuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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