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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82a32208f8f59679d30a81b9780918dce8141ca870d2818aa53351b5ebb23df' 
  AND token = 'FMl7f99E8f6KG72EBfc5SlFQPcqEpw6EQCi/HNCVbsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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