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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3f8faea369e7be06e4ebe4bf59679a06b894b7a163bfdc34698306fa52f99c' 
  AND token = 'DgXh8YEzzvHW+WcC1n4q9LPqjRWfwXPsfWrqLiSntmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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