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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93586fca0d5228725e1c9c021cb85c240f6f7cea1aaa4cfcd6d272eee8ddf2d' 
  AND token = 'kAFDMHarDUEylyu3x9nznF8nXwfwm1Hcw8bA5cnRz0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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