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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63a0b3b8d069c1098dd76375eb5e5333478fdca3bbfd08059b438fb59774b44' 
  AND token = 'xEbpPSucIfN6DaByK7yJQ1zyPL5PX/AH6VqCCcu38No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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