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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964f8a5628a86b9b7f879ff754e617bed63c6f83c96e9d5227d0924246cba3af' 
  AND token = 'cKDDusD96HQxKtC2ik9eCgZE7SMy/XUjlIzCK/VDD6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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