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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5f4b36c1ce1c4a2a8f318f84f574db69ea7f1e93adc1d6d31e6ec00f8a09ff' 
  AND token = 'nJp1yq47p5yzj5iy1lFx6whfFEl+F9vzdGfgZrRpfEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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