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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e79589588da8747c752bc6c1cc2f0c56a4a2048363b0ed83a990f3d8de98e66' 
  AND token = 'twSopCiYW2fR5gvDEdT+4afct0iVd/5Ra/q1dh1N12I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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