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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e695efef5822c001fe17a8df49145547745e2184f960ea791581aa1a36300edc' 
  AND token = 'nU/h1Pnc6e28nQJPt7AOX0Rhff07Wg6RUnXtKW0eoog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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