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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1de8e4063093cc5fbe3d6001155b22b34bc4fa7f45f32b6b410d63d0598a68' 
  AND token = 'L6aCE9dIdt1MZBAt3XDFyil/tcAhRjnY9PUEzivULCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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