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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e17b6bb36ce40382d875b76b9c1b9b8f15dd2b92f3fec5849f0f2c40ab55d3' 
  AND token = 'xa/19x+laoH1b7VaOQKfMtnr/N5q68E3ArS3j5+NzQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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