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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4947a4082dda6260e0bf6f34fc1487e5b0f91d1b418787b299e5e9c17143c081' 
  AND token = '/C5wfat1rul1NdiC7P/LsXyJmq5V1arnNacmGyBH+E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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