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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f4467639769dfe928d2a5e3f24f67cac9dbdbf2f8dc4cee5119ec72e859a37' 
  AND token = 'v0YRI+mCrOyksjYyAYNnP2G4On9YZ69LSXn0KBVJ2j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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