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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f0d4269c4d888599f058f27a36af6b45b8a7ccd7f35f8f4955700681f9c2ae' 
  AND token = '0sMRjt0eqBlP7iMwr6j804CBowKQFXDYplfqb+ymj+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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