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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00f0f14008196d4f71c6f4ea1ce442825bcc37674e86d85ea30bbdd97f28e92' 
  AND token = '4T+krJag/oEV8oIz7M47TVHE8KxqB6/0O3q3X64B96U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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