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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e02e1a563373f3b1092b4636e36ed500e20b1ca144b48c3bb2263a593c1a92b' 
  AND token = 'BYYilP/SOsLA8Xi3j5Kisurg1wDnCdEFeujUOoZNskc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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