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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c5da7c144da9ae7ca33e376f3653864c812444c566cf8a566f777e63c851dd' 
  AND token = 'v+yxg7G//uGgC3H6vKLqKi4pfjO+px0T0K2mfrcXUfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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