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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c79f53870f401c7bf84d1e019071baec9ba5a5700e80e254cc68f0031e67f33' 
  AND token = 'EL563gc2wd1ij7HogSQJDpqAjWhdc3INzzSnxPbPqzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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