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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3312191b8f9e2562b1424624a6274b8edf363003a37a841cf1f566aa72b2ebf3' 
  AND token = 'E4aweCVFV0nKg8UbwANf/f91iMoHLDlMN4XNJo+NHOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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