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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec3cd85b669441862c91baa82f4ac008bc1a56ae4295cbb90fea7c2eae4bb0c' 
  AND token = 'nC8reo6Mt+BDtQamhvJkkKpYDdxkrjW3bI2cHe9Wcj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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