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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10401cef409333db5adc18a4a0bca56db6164069e673c4cff20b68d0e858c422' 
  AND token = '8fKFPhAYAB2hSwQ9OG3oCxwSIADzyeRy8Az186TXtms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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