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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0101755724e4e4eee9eba49404cf19f6b868ce22b2ad7bd1fa3d62ae7db8c9fd' 
  AND token = 'nY7OIAlMtPdJYIO0zuA0XTjkabxocqCdbN3XeuD9284=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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