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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5a3c57a396fb2c0c848bd4e40de3b42d87ecd5169674febdb1b5c703df87c4' 
  AND token = 'rdE1xv1Hrf1hHOED0y/CWrqPmMrcHzfCw6Hqo/grRws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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