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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116cba19e524ad3e548f3916e057f521dd0bef476d2139ab7a5d284fb7619d31' 
  AND token = 'uP3iDR46jCcUZtMN34rADWaUmN6VVKtkB45qjEsI2E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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