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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4328e8fa9665cbe1060e49e73b3bff28522631f9adfffd6f62c2ff9aab02be' 
  AND token = 'VKc/uDaSMAaaFg1TUvinXEyycHMV+PRSiPMCv+JBMv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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