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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5cddcde7d545b2b7f949767390266eb049e4c9273de66b18cd8d520ef67431' 
  AND token = 'znA4wHaZAuLAJAedclVdN9yNVsSbRq77Zt102EC5yVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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