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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dac62111c169d2858513a3d3ce66f2c01d3090919ab5f20564ad369be0a6e63' 
  AND token = '0yA58lxqhELiTqEv8aotr8KzZR6qM18Si15kpWPBaK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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