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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7d3af2ca1541d64c673004507a2d4e164c77352c5c90ba83574a1da9d94dc7' 
  AND token = '2PBs8rbKAInq/k9jHYl3z7FFnjUBn2eB17sOkHxyUtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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