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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9059b959a3f2dc6edd076ebc24f922bca106b300165cacfa2a0635c08b2e6fe' 
  AND token = '9ZdwaVPSX0EC+9kZOtiv8BM/uSLubg3At5cZgUdNGCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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