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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95d6f912fc4b8bcd3c31f99f9929870e25e336e4b89b8bcab8aa4ff9155ecf6' 
  AND token = 'J9eRfxPJyzO5eWu5eQOyheWzD3q/B08apdq8zg7/hzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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