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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114951c1fa07d703ff4f4451b35786196b9064ed51c9c92c305645ffe46a1d81' 
  AND token = 'lgUUG++A9nkUQopUNk19FqGgorXZrrrtJEf2/JkySvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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