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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cebfc96e01e92ee617e1b7ed381c94ce92e590706f35d4b5f34b15c25516302' 
  AND token = 'mALztvNa2qs1ncfDN7RODU1u0xKIyLlEXWbZbaPP89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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